Tubular mortise-lock.



H. E. FENDRING & W. D. LUTHER.

TUBULAR MORTISE LOOK.

APPLICATION FILED SEPT. 24, 1909.

' 984,366. Patented Feb. 14, 1911.

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H. B. PENDRING & W. D. LUTHER.

TUBULAR MORTISE LOOK.

APPLICATION FILED SEPT. 24, 1909.

984,366. Patented Feb. 14,1911. a 0 2 sumrs-snnnr 2.

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UNITED STATES PATEN T @FFIQE.

HELMER E. FENDRING AND WILLIAM D. LUTHER, F CHOUTEAU, MONTANA.

TUBULAR MORTISE-LOCK.

Specification of Letters Patent.

. atcnte(l Feb. 14,1911.

Application filed September 24, 1909. Serial No. 519,382.

T 0 all whom it may concern;

Be it known that we, Hamlin: 1C. Farsi RING and \VILLiaw l). LUIHER, citizens of the United States, residii'ig at Chouteau, in the county of Teton and State of Montana, have invented new and useful Improvements in Tubular BIortise-Locks, of which the following is a specification.

This invention relates to locks for doors and the like and it has for its objects to provide a simple and etlicient lock including two casings of cylindrical tubular form which may be readily fitted in mort'ises formed by ordinary auger drills.

Further objects of the invention are to simplify and improve the construction and operation of this class of devices.

ith these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter .t'ully described and particularly pointed out in the claim.

In the accompanying drawings has been illustrated a simple and preferred form of the invention; it being however understood that no limitation necessarily made to the precise structural details therein exhibited. but thatchanges, alterations and moditi'ations within the scope of the invention may be resorted to when desired.

In the drawings: Figure 1 is a side ele vation of a lock constructed in accordance with the invention. Fig. 2 is a top plan view Of the same showing the cover detached from one of the tubular casings. Fig. 3 is a view taken sectionally through the face plate on the line 3-43 in Fig. 1 and showing in top plan the other tubular casing with the cover detached. Fig. 4 is an end view of one of the tubular casings. Fig. 5 is a transverse sectional view taken on the plane indicated by the line 55 in Fig. 9. Fig. 6 is a vertical sectional View showing the improved lock in position for operation. F 7 is a perspective detail view of the latch used in connection with the improved lock.

Corresponding parts in the several figures are denoted by like characters of reference.

The improved lock comprises two cylindrical casings A and B which are suitably connected with each other through the medium of a Face plate C with which each of the casings may be connected in any convenient manner. Each of the tubular casings is provided with a detachable cover 9 having a beveled end 10 adapted to engage an undercut portion 11 ot' the cylinder wlth which it is connected; each of the cylinders is provided at what will be regarded as its inner end with an end closure 19 affording a seat for the inner end of the lid which may be connected detachably with said end closure by suitable fastening. means such as a set screw 13 whereby the cover will be held with sutlicient security for all practical purposes.

The casing which may be designated as the latch casing in contradistinct-ion to the bolt casing B is provided intermediate its ends with an apertured diaphragm 14; affording a bearing for the shank 15 of the latch 16 which latter is forced in an outward direction by means of a spring 17 coiled upon the shank or stem 15 intermediate the diaphragm l-fl and the butt end of the latch. Supported for rotation near the inner end of the casing A is the handle post with which is connected one end of a {lexible element 19, the other end of which is connected with the shank 1,5 of the latch. The latter may be withdrawn against the tension of the spring 17 by partially rotating the post 18 by means of the handle, when the flexible element 19 will be partially wound upon said post as will be readily understood.

Suitably guided in the casin; B is the bolt 20 the inner end of which is pivotally connected with a tumbler 21 actuated by a spring 52 in the direction of the lower side of the casing which is provided with a lug 23 adapted to be engaged by the downturned heel A and the free end of the tumbler. The latter is provided with a recess 25 hav ing overhanging lips 26 which are serrated as shown at 27 for engagement with the bit of a suitably constructed key; the bottom of the recess 95 is likewise provided with shoulders 28 to be engaged by the key. The casing B is provided in opposite sides thereof with apertures forming key holes 29. said key holes or slots being enlarged midway between their ends as shown at 30 for the insertion of the shank of the key which latter may thus be inserted or withdrawn when the bit is turned either toward the front or the rear end of the cylinder; this being rendered necessary by the fact that a complete rotation of the key is practically impossible within the limits of the casing.

From the foregoing description, taken in connection with the drawings hereto annexed the operation and advantages of this invention will be readily understood.

The construction of the improved lock is extremely simple and inexpensive; and the lock may be applied to an ordinary door by simply forming cylindrical mortises or auger holes in the latter and making a shallow mortise for the reception of the face plate; excessive weakening of the door by forming a mortise of large dimensions is thus avoided.

The general construction of the improved lock is of such a nature as to render it thoroughly efiicient for the purposes for which it is provided.

Having thus described the invention, what is claimed is In a lock of the character described, a cylindrical tubular casing including an end closure, an undercut lip portion, and a cover adapted to be seated upon the end closure and having a beveled end engaging the undercut lip portion, said cover having an aperture forming a keyhole slot having a key shank receiving enlargement midway between its ends, a bolt guided in the casin a tumbler hingedly connected with the bolt and having a recess provided with key-en gaging shoulders and overlapping serrated lips, an actuating spring for the tumbler, and a lug within the casing adapted for en gagement with the heel of the tumbler.

In testimony whereof we afiiX our signatures in presence of two witnesses.

HELMER E. FENDRING. WILLIAM D. LUTHER. \Vi tuesses:

James Suronoru, Arum/r l li/l ooun. 

